US20120216521A1 - Methods of controllling hydraulic motors - Google Patents
Methods of controllling hydraulic motors Download PDFInfo
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- US20120216521A1 US20120216521A1 US13/465,554 US201213465554A US2012216521A1 US 20120216521 A1 US20120216521 A1 US 20120216521A1 US 201213465554 A US201213465554 A US 201213465554A US 2012216521 A1 US2012216521 A1 US 2012216521A1
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- 239000012530 fluid Substances 0.000 description 61
- 238000006073 displacement reaction Methods 0.000 description 16
- 238000005553 drilling Methods 0.000 description 16
- 230000000712 assembly Effects 0.000 description 8
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
- E21B7/022—Control of the drilling operation; Hydraulic or pneumatic means for activation or operation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87169—Supply and exhaust
- Y10T137/87217—Motor
- Y10T137/87225—Fluid motor
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
- This patent application is a continuation of and claims priority to U.S. patent application Ser. No. 13/295349, filed Nov. 14, 2011, now U.S. Pat. No. 8,172,002, entitled “Method of Controlling Hydraulic Motors,” which is a divisional and claims the priority of U.S. patent application Ser. No. 12/412156, filed Mar. 26, 2009, now U.S. Pat. No. 8,118,113, entitled “Hydraulic Control System for Drilling Systems,” which specifications are all hereby incorporated by this reference in their entireties for all of their teachings.
- 1. The Field of the Invention
- The present invention relates to hydraulic control systems for drilling systems and to hydraulic control systems for drill heads in particular.
- 2. The Relevant Technology
- Drilling rigs are often used for drilling holes into various substrates. Such drill rigs often include a drill head mounted to a mast. The rig often includes mechanisms and devices that are capable of moving the drill head along at least a portion of the mast. The drill head often further includes mechanisms that receive and engage the upper end of a drill rod or pipe. The drill rod or pipe may be a single rod or pipe or may be part of a drill string that includes a cutting bit or other device on the opposing end, which may be referred to as a bit end.
- The drill head applies a force to the drill rod or pipe which is transmitted to the drill string. If the applied force is a rotational force, the drill head may thereby cause the drill string to rotate within the bore hole. The rotation of the drill string may include the corresponding rotation of the cutting bit, which in turn may result in cutting action by the drill bit. The forces applied by the drill head may also include an axial force, which may be transmitted to the drill string to facilitate penetration into the formation.
- In many instances, specialized drill heads are utilized for differing applications. For example, drill heads include drill heads that are selected to suit given drilling conditions. As a result when conditions change, a different drill head if not an entirely different drill rig is used, thereby increasing capital costs and/or down time.
- The subject matter claimed herein is not limited to embodiments that solve any disadvantages or that operate only in environments such as those described above. Rather, this background is only provided to illustrate one exemplary technology area where some embodiments described herein may be practiced.
- A hydraulic control system includes a first motor, a second motor, a pump operatively associated with the first motor, a first coupling valve operatively associated with the second motor, first parallel valves operatively associated with the second motor, and a first switching valve operatively associated with the first coupling valve and the first parallel valves. The first switching valve is configured to switch the first coupling valve between a first coupling state and a second coupling state opposite the first coupling state and to switch the first parallel valves between a first parallel state and a second parallel state opposite the first parallel state. While the first parallel valves are in the first parallel state a portion of the output of the first motor drives the second motor while the first parallel valves are in the second parallel state, the output of the pump drives the second motor.
- A drill head assembly includes a modular base assembly, a plurality of motor assemblies including at least a first motor and a second motor, the motor assemblies being configured to be interchangeably coupled to the modular base assembly, and a hydraulic control system configured to drive the first motor and the second motor including a pump operatively associated with the first motor, a first coupling valve operatively associated with the second motor, first parallel valves operatively associated with the second motor, and a first switching valve operatively associated with the first coupling valve and the first parallel valves. The first switching valve is configured to switch the first coupling valve between a first coupling state and a second coupling state opposite the first coupling state and to switch the first parallel valves between a first parallel state and a second parallel state opposite the first parallel state. While the first parallel valves are in the first parallel state a portion of the output of the first motor drives the second motor and while the first parallel valves are in the second parallel state a portion of the output of the pump drives the second motor.
- A method of drilling includes driving a first motor with a pump, selectively driving a second motor in series operation by blocking at least a portion of the output of the from passing through first parallel valves while directing at least a portion of the output of the pump through a first coupling valve to opposing inlets of the second motor such that a portion of the output of the first motor drives the second motor, and selectively driving at least one motor in parallel operation by directing at least a portion of the output of the pump through the parallel valves while blocking at least a portion of the output of the pump through the first coupling cartridge.
- This Summary is provided to introduce a switching of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential characteristics of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
- To further clarify the above a more particular description of the disclosure will be rendered by reference to specific examples that are illustrated in the appended drawings. It is appreciated that these drawings depict only typical examples and are therefore not to be considered limiting. The examples will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
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FIG. 1 illustrates a drilling system according to one example; -
FIG. 2 illustrates a rotary head according to one example; -
FIGS. 3A-3B are schematic diagrams of a control system according to one example; and -
FIG. 4 is a schematic diagram of a control system according to one example. - Together with the following description, the figures demonstrate non-limiting features of exemplary devices and methods. The thickness and configuration of components can be exaggerated in the figures for clarity. The same reference numerals in different drawings represent similar, though not necessarily identical, elements.
- A control system is provided herein that is configured to control a variety of motors, such as drilling motors, in parallel as well as in series. Such control can include controlling or driving valve in star (VIS) type motors in series as well as in parallel. Such a configuration can provide relatively high power and efficiency. This efficiency can in turn reduce heat buildup and problems associated with that buildup. For ease of reference, hydraulic control systems will be described, though it will be appreciated that the control system can be applied to other types of control systems. As discussed below, the hydraulic control system can allow for the use of motors with different hydraulic displacements without the use of mechanical clutches. Further, the flexibility of the hydraulic control system can provide for more gear combinations than other systems. While any motive power can be used, for ease of reference the control system will be discussed with hydraulic power as the motive power source.
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FIG. 1 illustrates adrilling system 100 that includes asled assembly 105 and adrill head 110. Thesled assembly 105 can be coupled to amast 120 that in turn is coupled to adrill rig 130. Thedrill head 110 is configured to have one or more threaded member(s) 140 coupled thereto. Threaded members can include, without limitation, drill rods and rod casings. For ease of reference, the tubular threadedmember 140 will be described as a drill rod. Thedrill rod 140 can in turn be coupled to additional drill rods to form adrill string 150. In turn, thedrill string 150 can be coupled to adrill bit 160 or other downhole tool configured to interface with the material to be drilled, such as aformation 165. - In at least one example, the
drill head 110 illustrated inFIG. 1 is configured to rotate thedrill string 150 during a drilling process, In particular, thedrill head 110 may vary the speed at which thedrill head 110 rotates as well as the direction. In particular, the rotational rate of the drill head and/or the torque thedrill head 110 transmits to thedrill string 150 may be selected as desired according to the drilling process. For example, the motors, pinions, and/or gear wheels may be interchanged to provide the rotational rate and/or torque desired to suit different drilling applications. - Further, the
sled assembly 105 can be configured to translate relative to themast 120 to apply an axial force to thedrill head 110 to urge thedrill bit 160 into theformation 165 during a drilling operation. In the illustrated example, thedrilling system 100 includes adrive assembly 170 that is configured to move thesled assembly 105 relative to themast 120 to apply the axial force to thedrill bit 160 as described above. As will be discussed in more detail below, thedrill head 110 can be configured in a number of ways to suit various drilling conditions. - In at least one example, the
drilling system 100 includes a hydraulic control system (not shown) configured to control the operation of thedrill head 110. In particular, as illustrated inFIG. 2 , arotary drill 200 can include amodular base assembly 205. Themodular base assembly 205 includes agear housing 210 that supports adrive flange assembly 230. Thegear housing 210 is configured to provide a base to which one or more motor assemblies, such asmotor assemblies motor assemblies drive flange assembly 230 to provide motive force to rotate a drill rod or other components. The hydraulic control system is configured to control the operation of a variety of motor types, including motors that are similar as well as motors that are different. In particular, the hydraulic control system can be configured to selectively drive the motors in parallel or series. Further, the hydraulic control system can allow for the use of motors having different displacements. In at least one example themotor assemblies -
FIGS. 3A-3B are hydraulic circuit diagrams of ahydraulic control system 300 according to one example. In the illustrated example, thehydraulic control system 300 can be secured to or integrated with a valve block. While the components described below can be positioned within a valve block, it will be appreciated that the components can also be positioned and arranged in any desired manner. - The
hydraulic control system 300 includes afirst switching valve 305A, afirst motor 310A and at least asecond motor 310B. Apump 315 provides motive power for the first andsecond motors first switching valve 305A cooperates with afirst coupling valve 320A and firstparallel valves second motor 310B between series and parallel operation with thefirst motor 310A and/or athird motor 310C. Similarly, asecond switching valve 305B can cooperate with asecond coupling valve 320B and secondparallel valves third motor 310C between series and parallel operation. Thehydraulic control system 300 can further include any number of additional motors having associated switching valves, coupling valves, and parallel valves. - In the illustrated example, the
pump 315 provides motive power to each of the motors. While a three motor system is illustrated, it will be appreciated that fewer or more than three motors can be used by employing additional coupling valves with associated parallel valves. Series operation will first be described, followed by a discussion of parallel operation. -
FIG. 3A illustrates thehydraulic control system 300 in series operation. In the illustrated example, fluid pathways that are at relatively higher pressures or flows are shown with heavier lines while fluid pathways at relatively lower pressures or flows are depicted with lighter lines. In at least one example, while thefirst coupling cartridge 320A is in one state, either open or closed, the associated firstparallel valves second coupling cartridge 320B is in one state the associated secondparallel valves - In both series and parallel operation, the
pump 315 is coupled to a valve, such as aspool valve 330. Thespool valve 330 in turn is coupled topathways Optional backflow valves first motor 310A. In at least one example, thevalves control system 300. - In both series and parallel, the
pump 315 provides fluid to thefirst motor 310A as well as the first andsecond switching valves pathways pathways hydraulic control system 300 to cause thefirst motor 310A to rotate in opposite directions while providing motive power for the operation of the first andsecond switching valves hydraulic control system 300 between series and parallel. Operation of thefirst motor 310A will first be introduced, followed by a discussion of the first andsecond switching valves - With respect to the
first motor 310A, greater flow throughpathway 335 will cause thefirst motor 310A to rotate in one direction while greater flow through 335′ will cause thefirst motor 310A to rotate in the opposite direction. In particular,pathway 335 is in communication with node Ni. Node Ni is in communication with pathways P1A and P1B. Pathway PIA is in communication with an inlet of thefirst motor 310A. Similarly,pathway 335′ is in communication with node N6. Node N6A is in communication with pathways P6A and P6B. P6B is in communication with the opposing outlet of thefirst motor 310A. Accordingly, thespool valve 330 is configured to direct fluid to opposing inlets of the first motor 31 OA to thereby drive thefirst motor 310A. - A portion of the flow through
pathways hydraulic control system 300 between series and parallel operation. In particular,pathway 335 is in communication with pathway P1B via node N1. Pathway P1B is in communication with node N2. Node N2 is in further communication with pathways P2A, P2B, and P2C. Pathways P2A and P2B are in communication with theparallel cartridges parallel cartridges parallel cartridges - Pathway P2C is in communication with node N3. Node N3 is in communication with pathways P3A and P3B. Pathway P3A inlets to the
internal flushing system 350. Node N4 illustrates an inlet configured to allow an external flushing system (shown inFIG. 4 ) to be coupled to the hydraulic control system. - Pathway P3B is in communication with node N5. Node N5 in turn is in communication with the
first switching valve 305A by way of pathway P5B and the second switching valve by way of pathway P5B. Accordingly, a fluid pathway can be established between thepump 315 and the first and secondparallel valves pathway 335. - A portion of the fluid that is directed through
pathway 335′ is also directed to the first andsecond switching valves pathway 335′ is directed to pathway P6B via node N6. Pathway P6B is in communication with node N7. Node N7 is in further communication with pathways P7A, P7B, and P7C. Flow of fluid relative to pathways P7A and P7B will be discussed in more detail in conjunction with the operation of theparallel valves 325A′, 325B′. - Pathway P7C is communication with node N3, which in turn is in communication with first and
second switching valves pump 315 is directed to the first andsecond switching valves FIG. 3A , pathways P2C and P7C direct a portion of the output of thepump 315 to node N3. This fluid pathway can provide the motive power for theparallel valves third drive motor valves second motor 310B and thethird drive motor 310C between series and parallel operation. - To switch the
second drive motor 310B between series and parallel operation, thefirst switching valve 305A opens and closes thefirst coupling cartridge 320A and the firstparallel valves pathways parallel valves parallel valves first coupling valve 320A can also include a biasing member that biases thefirst coupling valve 320A in the same position as the same position as the firstparallel valves - The first switching valve 305 can provide opposing inputs to the
first coupling valve 320A and the firstparallel valves first coupling valve 320A and the firstparallel valves - To operate the
second motor 310B in series, thefirst switching valve 305A can be switched such that thefirst switching valve 305A directs flow throughpathway 340 to maintain thefirst coupling valve 320A in an open position. This flow can be a portion of the output of thepump 315 as previously discussed. Further, while thefirst switching valve 305A is switched to series mode, thefirst switching valve 305A also directs fluid throughpathway 340′ to maintain the firstparallel valves - In particular,
pathway 340′ is in communication with node N8. Node N8 is in further communication with pathways PSA and P8B, which are in communication with firstparallel cartridges 325A′, 325A respectively. In series mode, the press inpathway 340′ can be high relative to the pressure inpathway 340 such that thefirst coupling cartridge 320A open and the firstparallel valves - The
second switching switch 305B can be operated to switch thethird motor 310C between series and parallel operation independently of thesecond motor 310B. In series mode, thesecond switching valve 305B directs flow throughpathway 345 to maintain thesecond coupling valve 320B in an open position. - While the
first switching valve 305A is switched to series mode, thesecond switching valve 305A maintains the secondparallel valves pathway 345′. In particular,pathway 345′ is in communication with node N9. Node N9 is in further communication with pathways P9A and P9B, which are in communication with secondparallel cartridges 325B′, 325B respectively. - Accordingly, the
second switching switch 305B can be configured to open and close thesecond coupling cartridges 320B and the secondparallel valves third motor 310C between series and parallel operation. Operation will now be described in which thesecond motor 310B and thethird motor 310C are both operated in series followed by a discussion thesecond motor 310B and thethird motor 310C are both operated in parallel. As previously introduced, in both series and parallel operation thepump 315 routes fluid throughpathways first motor 310A and node N2. - As previously discussed, node N2 is in further communication with pathways P2A, P2B, and P2C. Pathway P2A is in communication with second
parallel valve 325B while pathway P2B is in communication with firstparallel valve 325A. In series operation, both the firstparallel valve 325A and the secondparallel valve 325B are closed. As a result, fluid incident on node N2 is routed through pathway P2C. - Similarly, fluid routed through
pathway 335′ to node N6 is directed to an opposing inlet of thefirst motor 310A and to node N7. Node N7 is in further communication with the secondparallel valve 325B′ by way of pathway P7A and firstparallel valve 325A′ by way of pathway P7B. In series operation, the firstparallel valve 325A′ and the secondparallel valve 325B′ are closed such that flow incident on node N7 is directed through pathway P7C. - Pathways P2C and P7C are in communication with node N3. In at least one example, check valves can be positioned in one or both of the pathways P2C and P7C to allow fluid to flow from pathways P2C and P7C to node N3 while checking the flow of fluid in the reverse direction. Fluid from node N3 is then directed to either the
internal flushing system 350 via pathway P3A or toward the first and second switching valves as discussed above. - In the illustrated example, the
flushing system 350 includes afluid conditioner 359, such as a filter configured to filter particulates greater than about 5-10pm from the fluid. Thefluid conditioner 359 is in communication with apressure limiting valve 358. Thepressure limiting valve 358 can be configured to provide a selected pressure setting for theinternal flushing system 350 independently from the inlet pressure provided by pathways P2C and P7C. Such a configuration can help ensure the pressure levels of the fluid directed from theinternal flushing system 350 to themotors pressure limiting valve 358. - The
pressure limiting valve 358 is in communication with node N10. Node N10 is in further communication with aflow regulating valve 357. Pathway P4A is in communication with pathway P3B, and thus in communication with the first andsecond switching valves flow regulating valve 357 provides an appropriate oil flow for theinternal flushing system 350 according to the chosen motor size and/ or type and if the motors are in full or half displacement two-speed mode which may be a proportional or a fix adjusted on-off valve type. Accordingly, in series operation, fluid from theinternal flushing system 350 is directed through 366 to node N17 and via pathways 367 and 367′ to node N6 and node N9. Node N6 is in communication withparallel cartridge 320A and Node N9 is in communication withparallel cartridge 320B. The flow from the lubrication system fills then up leak oil from the motors when they are operated in series operation mode. This prevents damages due cavitations. - Fluid directed from the
internal flushing system 350 is incident on node N11. Node N11 is in further communication with pathways P11A and P11B. Pathway P11A is incident on node N12. Node N12 is in further communication with pathway P12A and pathway P12B, which is in communication with thefirst coupling cartridge 320A. In series operation thefirst coupling cartridge 320A is open. Accordingly, fluid flows through pathway P12A to node N13. Node 13 is in further communication with pathway P13B and pathway P13A. Pathway P13A is in communication with an inlet of thesecond motor 310B while pathway P13A is in communication with thefirst coupling cartridge 325A, which is closed in series operation. Accordingly, a portion of the flow incident on node N12 is routed to an inlet of thesecond motor 310B. - Another portion of the flow incident on node N12 is routed to an opposing inlet of the
second motor 310B. In particular, as introduced thefirst coupling valve 320A is open in series operation. Accordingly, fluid directed to pathway P12B passes through thefirst coupling valve 320A tooutlet 360.Outlet 360 is in communication with node N14. Node N14 is in further communication with pathways P14A and P14B. Pathway P14A is in communication with the opposing inlet of thesecond motor 310B while pathway P14B is in communication with firstparallel cartridge 325A′, which is closed in series operation. Accordingly, fluid from theinternal flushing system 350 is directed to opposing inlets of thesecond motor 310B during series operation. - In series operation, the
second motor 310B is coupled to an output of thefirst motor 310A in such a manner that motive power for driving thesecond motor 310B is received from thefirst motor 310A. The coupling can be mechanical, such as by a shaft and/or hydraulic or any other type of coupling. - This configuration allows a portion of the motive power that drives the
first motor 310A to also drive thesecond motor 310B and/or thethird motor 310C in series. In particular, thepump 315 is coupled to a valve, such as thespool valve 330. Thespool valve 330 in turn is coupled topathways - Accordingly, a portion of the motive power directed to the
first motor 310A is used to drive thesecond motor 310B. As described above, thefirst coupling cartridge 320A is configured to deliver equal flow to each of the inlet of thesecond motor 310B. Equal flow to each of the ports may cause the flow from one port to balance the force from the other port resulting in no net force due to flow from thefirst coupling cartridge 320A. Such a configuration in turn may allow thesecond motor 310B to rotate freely and without back pressure. In addition, the flow of fluid from theinternal flushing system 350 can allow differently sized motors to be driven in series. In particular, the volume within thesecond motor 310B can be maintained as desired through the flow of fluid from thefirst coupling cartridge 320A as provided by theinternal flushing system 350. - As previously discussed, additional motors can also be coupled to the hydraulic control system and driven in series or parallel. For example, an output of the
second motor 310B can be coupled to thethird motor 310C. As introduced, theinternal flushing system 350 directs a balanced flow to opposing inlets of thesecond motor 310B through node N11 via pathway P11B. Theinternal flushing system 350 also directs a balanced flow to opposing inlets of thethird motor 310C through node N11 via pathway P11A. - Pathway P11A is in communication with node N15, which is in further communication with pathways P15A and P15B. Pathway P15A is in communication with node N16, which is in further communication with pathways P16A and P16B. Pathway P16B is in communication with second
parallel cartridge 325B′, which is closed in series operation. - Accordingly, fluid incident on node N6 is routed to pathway P16A, which is in communication with an inlet of the
third motor 310C. The opposing inlet of thethird motor 310C receives a balanced flow via node N15 as well. In particular, node N15 is in communication with thesecond coupling cartridge 320B by way of pathway P15B. When open thesecond coupling cartridge 320B receives the flow from pathway P15B and directs it to anoutlet 365, which is in communication with node N17. Node N17 in turn in communication with pathways P17A and P17B. Pathway P17A is in communication withcoupling cartridge 325B, which is closed in series operation. Accordingly, fluid incident on node N17 is directed to pathway P17B, which in communication with an opposing inlet of thethird motor 310C to balance the flow of fluid received by theother inlet 310C. - As a result, the
third motor 310C can operate efficiently using the output of thesecond motor 310B as thethird motor 310C is able to rotate freely and without backpressure. In addition, the flow of fluid from theinternal flushing system 350 through thesecond coupling cartridge 320B can allow differently sized motors to be driven in series as described above. - In addition to providing series operation for the
motors hydraulic control system 300 allows for parallel operation, as illustrated inFIG. 3B . In parallel operation, thefirst coupling cartridge 320A and thesecond coupling cartridge 320B are closed while the associatedparallel valves first coupling cartridge 320A can be closed and the first parallel valves opened 325A, 325A′ by thefirst switching valve 305A by way ofpathways second coupling cartridge 320B can be closed and the second parallel valves opened 325B, 325B′ by thesecond switching valve 305B by way ofpathways - Accordingly, fluid from the
pump 315 can be directed frompathway 335 to pathway P1B. Pathway P1B is in communication with node N2. As introduced, a portion of the flow incident on node N2 is directed to theinternal flushing system 350 and the first andsecond switching valves parallel valves - Flow directed to the
parallel valve 325B is directed to node N17 via pathway N17A. Node N17A is in further communication withpathway 365 associated with thesecond coupling cartridge 320B, which is closed in parallel operation. Accordingly, a portion of the fluid incident on node N2 is directed to an inlet of thethird drive motor 310C. - Another portion of the fluid incident on node N2 is directed to an inlet of the
second motor 310B via pathway P2B In particular, pathway P2B is in communication with firstparallel valve 325A, which is in open in parallel operation. Firstparallel valve 325A thus directs the fluid received from pathway P2B to node N13 via pathway P13A. Node N13 is in further communication with pathway P13B and pathway P12A. - Pathway P12A is operatively associated with the
internal flushing system 350 through node N11 by way of pathway P11B. Accordingly, the pathway P12A provides a flow to node N13 to supplement the fluid received from pathway P13A and directs the combined flow to an inlet of thesecond motor 310B. As a result, in parallel operation fluid incident on N1 by way ofpathway 335 is directed to inlets of the first, second, andthird motors - A portion of the fluid incident on node N6 by way of
pathway 335′ is directed to opposing inlets of the first, second, andthird motors first motor 310A. Another portion of the flow is directed through pathway P6B to node N7. Node N7 is in further communication with pathways P7A, P7B, and P7C. Pathway P7C is in communication with theinternal flushing system 350 via node N3. Pathways P7A and P7B are in communication with secondparallel valve 325B′ and firstparallel valve 325A′ respectively, which are each open. As a result, fluid directed to firstparallel valve 325A′ is directed to node N14 via pathway P14B. Node N14 is in further communication with pathways P14A and 360.Pathway 360 is in communication with thefirst coupling cartridge 320A, which is closed. Accordingly, a flow directed to firstparallel valve 325A′ is directed to an opposing inlet of thesecond motor 310B. - A flow directed to the second
parallel valve 325B′ is directed to node N16 via pathway P16B. Node N16 is in communication with node N15 via pathway PISA. Node 15 is in further communication with theinternal flushing system 350 by way of pathway PHA and node N11. The fluid node N16 from secondparallel valve 325B′ and theinternal flushing system 350 is directed to an opposing outlet of thethird drive motor 310C. - Accordingly, flow from
pathway 335 is directed to inlets of the first, second, andthird motors pathway 335′ is directed to opposing inlets of the first, second, andthird motors internal flushing system 350 is configured to provide a supplemental flow to help ensure proper flow at all operating pressures. Such a configuration can help ensure proper operation of themotors motors - In addition, as illustrated in
FIG. 4 , thehydraulic control system 300 can have additional, optional valve assemblies. For example, optional two-speed valve assembly 400 operatively associated therewith. The optional two-speed valve assembly 400 can receive a flow via node N18 and node N19, which receive a portion directed to the flow directed to the first and second switching valves 315A, 315B as described above. The two-speed valve assembly 400 can includevalves 410 and/or 410′ operatively associated with the second andthird motor valve 420 can be operatively associated with thefirst motor 310A. - Each or all of the
valves speed valves internal flushing system 350 as the volume which has to circulate by freewheeling of the associated motor is lower and thus less flushing oil flow is needed, Reducing the volume of the flushing oil can help ensure a higher possible RPM of the associated motor. - In at least one example, the two
speed valve 420 provides an oil flow to a two-speed port on thefirst motor 310A viapathway 425. Theother motors pathways motors - In at least one example, the two-
speed valves FIG. 4 the two-speed-valves parallel valves parallel valve 305A directs an output through pathways P8A and P8B′ to close parallel cartridges. In particular,pathway 340′ is in communication with node N8. Node N8 is in further communication pathways P8A and P8B. Node N20 is positioned between pathway P8B and pathway P8B′. Pathways P8A and P8B′ are in communication with firstparallel valves 325A′, 325A respectively. Node N20 is in further communication with two-speed valve 410 via pathway P20. Accordingly, a portion of the fluid thefirst switching valve 305A directs throughpathway 340′ is directed to two-speed valve 410 to thereby open the two-speed valve 410. - The two-
speed valves speed valve 420 can be electrically operated and be actuated by the pilot oil from node N20 when either of the switchingvalves speed valve 410′ can be received from node N22. In such a configuration, whenmotor 310B and/or 310C are changed, from parallel to series operation as described above, the two-speed function will switch themotors pathways - All the two-speed valve(s) 410,410′, 420 can also include a connection for the tank line via node N21. In particular, node incident on node N21 flows from N21 back to a reservoir or
tank inlet 430. Accordingly, in series operation a portion of the fluid received from N19 flow viavalve 410 and/or 410′ and/or 420 to the two-speed ports on the motors and change their position from half displacement to small displacement. As previously discussed, in series operation fluid from thepump 315 is split between opposing inlets of thefirst motor 310A and node N3. Fluid incident on node N3 is further split between theinternal flushing system 350 and the first andsecond switching valves - Accordingly, two-
speed valve 410 automatically reduces the volume of fluid directed trough atleast motor 310B. Because of that the oil volume which has to circulate by freewheeling of the motor is lower and less flushing oil flow is needed and which ensures a higher possible RPM. - When the two-speed valve is open 410, fluid directed to the two-
speed valve 410 is directed to node N21, which is in communication with the other two-speed valve(s) 410′, 420 and a reservoir ortank inlet 430. Accordingly, in series operation a portion of the fluid received and transmitted by thefirst switching valve 305A opens the two-speed valve 410 and is then diverted to the fluid reservoir via thetank inlet 430. As previously discussed, in series operation fluid from thepump 315 is split between opposing inlets of thefirst motor 310A and node N3. Fluid incident on node N3 is further split between theinternal flushing system 350 and the first andsecond switching valves - As previously discussed, the
internal flushing system 350 provides fluid to opposing inlets of thesecond motor 310B when thesecond motor 310B is driven in series. By diverting a portion of the fluid incident on node N3 to thetank inlet 430, the two-speed valve 410 reduces the volume of fluid theinternal flushing system 350 directs to themotors 310B and/or 310C in series operation. Accordingly, two-speed valve 410 automatically reduces the volume of fluid directed to atleast motor 310B. Because of that the oil volume which has to circulate by freewheeling of the motor is lower and less flushing oil flow is needed and which ensures a higher possible RPM. - Similarly, two-
speed valve 410′ can reduce the flow of fluid theinternal flushing system 350 directs to the second and/orthird motors parallel valve 305B directs an output through pathways P9A and P9B′ to close secondparallel cartridges 325B′ 325B respectively. In particular,pathway 345′ is in communication with node N9. Node N9 is in further communication pathways P9A and P9B. Node N22 is positioned between pathway P9B and pathway P9B′. Pathways P9A and P9B′ are in communication with secondparallel valves 325B′, 325B respectively. Node N21 is in further communication with two-speed valve 410′ via pathway P22. - Accordingly, a portion of the fluid the
second switching valve 305A directs throughpathway 345′ is directed to two-speed valve 410′ to thereby open the two-speed valve 410′. Two-speed valve 410′ is in communication with node N21, which is in communication withtank inlet 430. Accordingly, two-speed valve 410′ automatically reduces the volume of fluid directed to atleast motor 310C. Because of that the oil volume which has to circulate by freewheeling of the motor is lower and less flushing oil flow is needed and which ensures a higher possible RPM. -
FIG. 4 also illustratesadditional valve assemblies motors valve 440 via node N23 and pathway P23. Such a configuration causes a portion of the flow thefirst switching valve 305A outputs throughpathway 340′ is directed tovalve 440. This portion of the flow can act to openvalve 440.Valve 440 is in communication withvalve 450 as well aspathway 460.Pathway 460 is in communication with pathway P16B via node N25. - Pathway P16B is in communication with
third drive motor 310C by way of node N16 and pathway P16A (FIGS. 3A-3B ). Accordingly,valve 440 is in communication withthird motor 310C. Whilevalve 440 is open, a pathway is established betweenvalve 450 and thethird motor 310C.Valve 450 can be or include a pressure limiting valve. Such a configuration can allowvalve 450 to maintain the pressure of thethird motor 310C below a desired level and thereby protect thethird motor 310C from pressure spikes or other pressure increases. In the illustrated example,valves first switching valve 305A. In other examples, thevalves second switching valve 305B and/or be operatively associated with thesecond motor 310B. - Referring again to the example shown in
FIG. 4 ,valves 440′, 450′ can be actuated by thesecond switching valve 305B to help protect thesecond motor 310B from pressure spikes. In particular, thesecond switching valve 305B is in communication withvalve 440′ by way ofpathways 345′, P9B and P26 via node N26. Thesecond switching valve 305B can direct a flow via this pathway to open thevalve 440′. -
Valve 440′ is in communication with thesecond motor 310B viapathway 470, node N27 andpathway 365. When thevalve 440′ is open,valve 450′ is also in communication with thesecond motor 310B by way ofvalve 440′Valve 450′ can be or include a pressure limiting valve. Such a configuration can allowvalve 450′ to maintain the pressure of thesecond motor 310B below a desired level and thereby protect thethird motor 310B from pressure peaks or other pressure increases. In the illustrated example,valves 440′, 450′ are actuated by thesecond switching valve 305B. In other examples, thevalves 440′, 450′ can be actuated by thefirst switching valve 305B and/or be operatively associated with thethird motor 310C. Accordingly, optional valves can be provided to protect the second andthird motors - As previously introduced, node N4 can be configured to allow the
hydraulic control system 300 to have anexternal flushing system 480 coupled thereto. Theexternal flushing system 350 can be configured to provide additional flow as desired to provide a desired displacement and/or additional cooling. - The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (2)
Priority Applications (1)
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US13/465,554 US8408328B2 (en) | 2009-03-26 | 2012-05-07 | Methods of controllling hydraulic motors |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US12/412,156 US8118113B2 (en) | 2009-03-26 | 2009-03-26 | Hydraulic control system for drilling systems |
US13/295,349 US8172002B2 (en) | 2009-03-26 | 2011-11-14 | Methods of controlling hydraulic motors |
US13/465,554 US8408328B2 (en) | 2009-03-26 | 2012-05-07 | Methods of controllling hydraulic motors |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/295,349 Continuation US8172002B2 (en) | 2009-03-26 | 2011-11-14 | Methods of controlling hydraulic motors |
Publications (2)
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US20120216521A1 true US20120216521A1 (en) | 2012-08-30 |
US8408328B2 US8408328B2 (en) | 2013-04-02 |
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US12/412,156 Expired - Fee Related US8118113B2 (en) | 2009-03-26 | 2009-03-26 | Hydraulic control system for drilling systems |
US13/295,349 Expired - Fee Related US8172002B2 (en) | 2009-03-26 | 2011-11-14 | Methods of controlling hydraulic motors |
US13/465,554 Expired - Fee Related US8408328B2 (en) | 2009-03-26 | 2012-05-07 | Methods of controllling hydraulic motors |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
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US12/412,156 Expired - Fee Related US8118113B2 (en) | 2009-03-26 | 2009-03-26 | Hydraulic control system for drilling systems |
US13/295,349 Expired - Fee Related US8172002B2 (en) | 2009-03-26 | 2011-11-14 | Methods of controlling hydraulic motors |
Country Status (10)
Country | Link |
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US (3) | US8118113B2 (en) |
EP (1) | EP2411626A2 (en) |
CN (1) | CN102362046A (en) |
AU (1) | AU2010229931B2 (en) |
BR (1) | BRPI1009571A2 (en) |
CA (1) | CA2752542C (en) |
CL (1) | CL2011002331A1 (en) |
NZ (1) | NZ594425A (en) |
PE (1) | PE20120851A1 (en) |
WO (1) | WO2010111395A2 (en) |
Cited By (1)
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WO2020132007A1 (en) * | 2018-12-21 | 2020-06-25 | Bly Ip Inc. | High pressure injection flushing heads and systems including such flushing heads |
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Also Published As
Publication number | Publication date |
---|---|
EP2411626A2 (en) | 2012-02-01 |
WO2010111395A3 (en) | 2011-03-24 |
CN102362046A (en) | 2012-02-22 |
US8408328B2 (en) | 2013-04-02 |
WO2010111395A2 (en) | 2010-09-30 |
AU2010229931A1 (en) | 2011-08-25 |
US8118113B2 (en) | 2012-02-21 |
CA2752542A1 (en) | 2010-09-30 |
BRPI1009571A2 (en) | 2016-03-08 |
US20120055715A1 (en) | 2012-03-08 |
PE20120851A1 (en) | 2012-07-23 |
US20100243327A1 (en) | 2010-09-30 |
AU2010229931B2 (en) | 2012-12-06 |
CL2011002331A1 (en) | 2012-03-02 |
CA2752542C (en) | 2012-09-18 |
NZ594425A (en) | 2013-05-31 |
US8172002B2 (en) | 2012-05-08 |
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